One Back Horizontal Vent一个后面水平通风口
CROSSED BACK VENT背叉搅;背衩搅;背;背搅
bartack back vent end封背衩
BACK VENT HEIGHT后开气高
back vent pipe背部通气管
split at back vent背衩豁开
center back vent后中衩;后中叉
BACK VENT LENGTH后开叉长
BACK VENT OVERLAP WIDTH后开气叠宽